Pressure gauge



Apr. 10, 1923. 1,451,257

w. P. HAMMOND PRESSURE GAUGE Filed June 20, 1911 Patented Apr. 10, 1923.

UNITED STATES PATENT err-ice.

WILLIAM 1. HAMMOND, OF PLSSAIC, NEW JERSEY, ASSIGNOR TO A. SGHRADEBIS SON, INCORPORATED,

YORK.

OF BROOKLYN, NEW YORK, A CORPORATION OF NEW PRESSURE GAUGE.

Application filed June 20,

To all whom it may concern:

' Be it known that 1, WILLIAM P. Ha vr- MOND, a citizen of the United States, residing inthe city and county of Passaic, in

the State of New Jersey, have invented certain new and useful Improvements in ressure Gauges, and do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the 39 annexed drawings, which form a part of this specification.

-My invention comprehends certaln improvements in pressure gauges particularly designed for use in measuring the fluid 35 pressure in pneumatic tires, although not restricted to this particular use. The object of my invention is to provide an improved construction of gauge adapted for momentary application to the valve of a pneumatic tire to indicate the pressure within the tire and maintain such indication after the gauge hasbeen removed from the valve and unti the same has been reset.

In the accompanying drawings I have illustrated certain embodiments of my invention showing the general construction of the same.

Figure 1 is a. view in elevation, partly broken away, of one form of the invention. 39 Fig. 2 is a vertical section through the pressure gauge.

Figure 3 is a detail of a modification. Figure 4 is a view in longitudinal section taken on line 4-4 Fig. 2.

" The same reference numerals are applied to and denote corresponding parts in theseveral views.

The gauge mechanism is housed within a casing 1 which is in the form of a watch case provided with the usual stem 2, crown cap 3 and ring 4.

a indicates a bed plate upon which the gauge mechanism is mounted, 5 indicates thejusual form of Bourdon tube mounted at one end in a fixed block 6, and pivotally connected at its other end to an adjusting link 7 8 indicates a bridge piece or support for the shafts 9 and 10 upon which are mounted the rack 11 and pinion 12 all of which are of usual and well known conand this end engages the free end of the 1911. Serial No. 634,225.

struction and need not be more fully described.

Upon the shaft 10 is mounted a toothed wheel or ratchet 13. This wheel is provided with a depending limiting stop 14 which engages a similar stop 15 on the bridgepiece 8 to prevent the indicating dial or 1 hand from overriding itself while being reset. 16 indicates a shaft mounted upon the plate a which serves as a support for the pawl 17, the latter under tension of spring 18 normally engages the ratchet wheel 13 so as to trap the same in indicating position when operated.

19 indicates a plate slidably mounted upon the base plate a by means of suitable guide pins or screws 20 operating in slot 21. The end of this plate is turned upward at 22 awl the ment 17 so that when the plate is actuate awl will be thrown out of 'enga 1 with the wheel 13. The sliding p ate 19 is connected to the crown 3 by means of a stem 23. Surrounding the stem is a spring 24 which bears against the crown 3 and holds the engaging end 22 of late 19 in I its IBlZIQCtGd POSltIOII so that t e pawl 17 will be in engaging position with the ratchet wheel 13.

Mounted upon the. ratchet wheel 13 by means of suitable screws 24 is the dial plate 25 rovided with indicating numerals or gra uations. An opening 26 is provided in the case 1 through which the pressure indication may be read. 27 is an indicator arrow or mark.

28 indicates the valve engaging end of the gauge and is provided with a rubber seat 29 and a valve depressor 30 which is de signed to fit against the valve casing of a tire and depress and open the valve to permit the air pressure to enter the gauge as may be readily understood.

In Figure 3 I have shown in lieu of the rotating dial an indicating hand 31 which is fastened to and rotates with the shaft 10 carrying the ratchet wheel 13. In this case the dial is fast to the case 1 and a crystal 32 is employed so that the entire dial is visible.

The operation of the gauge is thought to window in the casing.

be apparent. The end or seat 28 is pressed against the valve of the tire,'the depressor 30 engaging the valve and permitting the air to enter the tube 5. As the tube 5 expands the shaft 10 carrying the ratchet wheel 13 and dial is rotated and the pressure indication showing the amount of pressure in the tire is visible through the the teeth 'of the wheel holds the indication so that the same may be read after it has been removed from the valve of the tire.

In order to reset the dial or hand as the case may be, the crown 3 is depressed and the end 22 of the sliding plate 19 engages the pawl 17 rocking the latter and disengaging it from the ratchet wheel 13 thus permitting the dial or hand to regain its zero or initial position under the tension of the Bourdon tube 5.

lVhile I have illustrated and described. certain preferable embodiments of my invention I would have it understood that l am not restricted to the precise details of construction shown as the same may be departed from and still be within the scope and tenor of the appended claims.

Having thus described my invention what I claim as new herein and desire to protect by Letters Patent is 2- 1. A gauge for ascertaining the air pressure in applied inflated tires comprising a.

Bourdon tube, a movable pressure indicating element operably connected to said Bourdon tube, means for retaining said indicating element in a position in which it is moved by said Bourdon tube, means for temporarily establishing a pressure communicating connection between the tire valve and Bourdon tube, said means including a press on resilient member, adapted to form a substantially airtight connection with the tire valve casing when pressed against it, a fixed presser foot associated with said resilient seat and adapted to depress the tire valve plunger and means operable to cause the restoration of said indicating element to zero position, said latter means including a push member operable from the exterior of the gauge casing. v

2. A gauge for ascertaining the air pressure in applied inflated tires comprising a casing having metallic front and rear walls, a pressure responsive element, in the casing, an indicating-disc rotatably mounted in the casing and operably connected with said pressure responsive element. said disc having pressure-indicatin indicia located thereon in annular series, he front wall of said casing having a window therein through which a pressure indication predetermined by the position of the disc may be observed, means for retaining the indicating disc in the position in which it is moved by-the pres- The pawl engaging ,mally in inoperative position.

ascertaining the air preshaving a passage therethrough communieating with the pressure responsive element associated with said seat and adapted to depress the plunger of the valve.

3. A portable pressure gauge for pneumatic tires, including a casing, a seat projecting from one side of the casing and adapted to engage the valve casing of a pneumatic tire, means upon the seat for antomatically opening the tire valve when the J gauge is applied thereto, a tubular stem projecting from the opposite side of the casing. a cap upon the tubular stem, indicating means within the casing, means responding to pressure for operating the indicating means, means for holding the indicating means against backward movement, and a slide passing through the tubular stem and connected to the cap for releasing the indieating means.

4. A portable pressure gauge for pneumatic tires, including a casing, a seat projecting from one side of the casing and adapted to engage the air valve casing of a pneumatic tire, means upon the seat for automatically opening the valve of the pneumatic tire when the gauge is applied thereto, a tubular stem projecting from the opposite side of the casing, a finger piece applied to the tubular stem for convenience in grasping the gauge when applying the same to a tire, indicating means within the casing, means responding to pressure for moving the indicating means. means for preventing backward movement of the indicating means, a slide for releasing the indicating means, the said slide being formed with a portion which extends through the tubular stem, and a spring holding the slide nor- 5. A gauge for sure in applied inflated tires comprising a movable pressure indicating element, a presson seat for engaging the valve casing, a tire valve unseating clement adapted to unseat the tire valve to permit air from the tire to enter the gauge and operate the indicating element and means for retaining the indicating element in indicating position after the air has been exhausted from the gauge upon its removal from the valve casing.

6. A gauge for ascertaining the air pressure in applied inflated tires comprising a s press-0n seat for engaging the yalve casing, tion after, the pressure of the air is removed a tire valve unseating element, pressure refrom the pressure responsive member. sponsive member provided w1th.an open unrestricted passage-way leading from the tire LLIAM HAMMQND' 5 valve unseating element thereinto a pressure In the presence ofindicating e1ement, and means for retaining A. E. MITCHELL,

the indicating element in indicating posi- L. A. GERAU. v t 

